Remixable Digital Law School Casebooks. Metacrap or Controlled Vocabulary?

Harvard Law School professor Jonathan Zittrain and his team showcased Collage at the Berkman Center today. What's Collage? It's a tool that facilitates the creation of "an online casebook that's free, remixable and that can be used not just for a specific class, but for instructors" in law schools.

Does this organizing system still make use of a "controlled vocabulary" because the annotations are done by law school professors even though they are no longer "put together by a few professors and published in hardback books"? Or is it another display of metacrap?